From the above images you can probably see that our RAINBOW colour space has some pretty crippling limitations. It can only represent seven solid colours with no gradation between them. It can’t display black or white and has no latitude for hue or saturation. It’s possibly the worst colour space ever invented. Shame on me! It does however illustrate my point that a colour space is just a way of numerically representing colours that some sort of device can interpret. Different colour spaces are kind of like different languages, and we need to be able to interpret between them. You can also hopefully see that there are limitations. A certain colour that can be represented by one colour space, my not be accurately reproduced by another. The range of values that can be represented are known as the colour space’s gamut (not to be confused with gamma). RAINBOW can be said to have a very small gamut.